Spoofing attack in Firefox for iOS - CVE-2026-81267
Published: August 31, 2026
Vulnerability identifier: #VU146532
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-81267
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data. A malicious webpage can stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content.
Affected software
Firefox for iOS
How to mitigate CVE-2026-81267
Install updates from vendor's website.
Firefox for iOS - update to 155.0